CN1127942A - Guide type radiation-proof antenna for hand mobile telephone - Google Patents

Abstract

The directional anti-radiation antenna for mobile telephone set can prevent the damage of electromagnetic radiation to human head. A director is installed near the antenna that is vertically installed on the top of said telephone set to generate mutual coupling function between them, attaining the goal of directional radiation. The director and antenna are cast in a rubber sleeve tube fixed to shield part by screw nut.

Description

Guide type radiation-proof antenna for hand mobile telephone

The present invention relates to a kind of guide type radiation-proof antenna for hand mobile telephone, belong to the technical field of the antenna of hand telephone set.

Hand telephone set popularize to use in the city gradually, on the living conditions or work go up contact a lot of convenience be provided, when people used, the electromagnetic wave of its aerial radiation had certain harm to health, does not still have reliable safety measure at present.

The objective of the invention is to provide a kind of guide type radiation-proof antenna for hand mobile telephone, it can remedy above-mentioned deficiency, mainly be to add in antenna inside to adorn a director, antenna is according to the principle that produces the mutual coupling effect between active dipole and the director, the length of two oscillators of reasonable selection and mutual spacing distance, make after the combination, reach the purpose of directed radiation.Itself the input impedance of the geometric influence of parasitic element, as long as adjust the magnetic figure that its input impedance just can change this combined antenna, its directional pattern also can change, and reaches the requirement of directed radiation thus.

The object of the present invention is achieved like this:

Telephone set body upper end setting installation one antenna, antenna one side add adorns a finder.This director and a day line parallel, the equal casting of antenna and director forms an antenna body in a gum sleeve, and the outside is fixed in it in the shielding partly of body upper end with locknut.

The length of antenna can be selected 1/4 λ for use, or 3/4 λ, and λ is its wavelength.

The cross section of director is garden arc or square groove shape, or flat shape.

Telephone set inside is added and is adorned a director, and wireless according to producing the mutual coupling effect between active dipole and the director, the length and the phase mutual edge distance of selected two oscillators make the antenna direction radiation.The similar heart deltoid of the horizontal directive tendency (H.D.T.) of antenna is in end user's head one square one-tenth one place of safety.

Fig. 1 is the schematic diagram of radiation-proof antenna.

Fig. 2 is antenna configurations and directivity schematic diagram thereof

Fig. 3 is an antenna horizontal directive tendency (H.D.T.) schematic diagram

Now in conjunction with the accompanying drawings to the guide type radiation-proof antenna for hand mobile telephone schematic diagram.

By Fig. 1, on hand-held electricity is lived machine body (1), erect antenna (2) is housed, add in antenna inside and adorn a director (3), parallel with antenna, antenna (2) and director 3 are integral with gum sleeve (4) casting, form an antenna body, shielding partly (6), locknut (5) are arranged at body (1) top, be fixed in shielding partly above (6) with screw thread, rotate locknut (5), antenna body is rotated, to adjust its orientation.

By Fig. 2, active dipole (antenna just) resonance is 900MHz,

L=8.3nH C=3.52pf Z0=50 Ω is according to formula: $f=\frac{1}{2\mathrm{\Π}\sqrt{\mathrm{LC}}\mathrm{}}$ $E0=\sqrt{\frac{L}{C}}$

$E1=-M\frac{\mathrm{diz}}{\mathrm{<figure-callout\; id="2"\; label="dt\; E"\; filenames="A9510015900061.png"\; state="\{\{state\}\}">dt</figure-callout>}}$ $E$ $2=-M\frac{\mathrm{dil}}{\mathrm{dt}}$

E0=Z1 Z1 is the transmitter internal resistance

By Fig. 3, the similar heart deltoid of the horizontal directive tendency (H.D.T.) of antenna (2), one side has a safety zone at end user's head, can guarantee that end user's head exempts from the strong electromagnetic wave radiation

Compared with prior art, ambulatory handheld electricity guide type radiation-proof antenna alive has following advantages:

1. directionality is obvious, makes it to form the feeble field district, so claim place of safety, place of safety The safety standard of Nei Fu various countries regulation.

2. user's head exempts from the strong electromagnetic amplitude in the protection domain of place of safety Penetrate and reach the radiation proof purpose.

3. owing to be the guide type antenna so can strengthen guiding side reception and emission into, Opposite side equates with normal antenna, so signal can not descend when transmitting and receiving And can improve the sensitivity of reception.

Claims (4)

1. guide type radiation-proof antenna for hand mobile telephone is characterized in that: telephone set body (1) upper end is erect an antenna (2) is installed, and antenna (2) one sides are added and adorned a finder (3).This director (3) is parallel with antenna (2), and antenna (2) and director (3) all casting form an antenna body in a gum sleeve (4), and the outside is fixed in it on the shielding part (6) of body (1) upper end with locknut (5).

According to claim 1 fast antenna, it is characterized in that: the length of antenna (2) can be selected 1/4 λ or 3/4 λ for use, λ is its wavelength.

3. antenna according to claim 1 is characterized in that: the cross section of director (3) is garden arc or square groove shape, or flat shape.

4. guide type radiation-proof antenna for hand mobile telephone, it is characterized in that: telephone set inside is added and is adorned a director, and antenna is according to producing mutual coupling effect, the length of selected two oscillators between active dipole and the director, and the phase mutual edge distance, make the antenna direction radiation.The similar heart deltoid of the horizontal directive tendency (H.D.T.) of antenna is in end user's head one square one-tenth one place of safety.

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